To make the tomato sauce, combine can of tomatoes, can of chilies, cornstarch, sugar, and coriander in blender; process until smooth. Pour mixture into a saucepan, bring to a boil. Reduce heat, simmer and stir. Combine ground turkey and onion in large skillet. Cook until turkey is lightly browned. Drain off pan drippings. Add cheese and seasonings; stir until combined. Fill each tortilla with 1/4 cup of turkey mixture. Roll up and place, seam side down, in a 12 x 7 x 2-inch pan coated with cooking spray. Pour 1/2 cup warm tomato sauce over tortillas. Cover with foil and bake at 350° for 20 minutes. Serve tortillas topped with warm sauce and a dollop of plain lowfat yogurt. *If using corn tortillas, dip each one in warm tomato sauce before folding to avoid breaking tortilla.